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v3.10.0.1

Note Employee benefits - Additional information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Transfers in or out of Level 1 | $ 0 | $ 0 |
Transfers in or out of Level 2 | 0 | 0 |
Transfers in or out of Level 3 | 0 | 0 |
ASU 2017-07 |  |  |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Reclassification Other Components From Personnel To Other Operating Expenses | 8,900 | 7,500 | $ 10,100
Pension Plans |  |  |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Service cost | 0 | 0 | 0
Termination benefit cost | 0 | 0 | 0
Pension Plans | ASU 2017-07 |  |  |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Reclassification Other Components From Personnel To Other Operating Expenses |  | 5,000 | 6,800
Pension Plans | Maximum |  |  |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Employer contribution | 44,000 |  |
OPEB Plan |  |  |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Service cost | 1,028 | 1,026 | 1,156
Termination benefit cost | 1,790 | 0 | 0
OPEB Plan | ASU 2017-07 |  |  |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Reclassification Other Components From Personnel To Other Operating Expenses |  | 2,500 | 3,300
Savings Plans |  |  |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Savings Plans | 70,400 | 58,400 |
Savings Plans Contributions | $ 12,700 | $ 10,000 | $ 8,800
Savings Plans Stocks Held | 1,490,253 | 1,644,706 |

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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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